I can see adventure land and storybook land being re-themed into 1 big area. Personally i would Renew the contract with SEGA. and re-theme both storybook land and adventure land to a Sonic the hedgehog IP area. this will mean new sonic related rides.
For CCL i can see the area being re done in 2016 with the removal of Ice age 4D and the expiration of Alton's contract with the Dahl family which will mean Goodbye CATCF.
Personally i would love to see a Stormrunner coaster being built in adventure land (Probably SW9) and will be called Sonic the hedgehog: Turbo boost. It will be like kingda ka but with a sonic theme in it.
Just because IP's expire doesn't mean that the area will to. CCL does have a standalone theme from these IP's, even if they were built around the area. CCL has Snorlix, flowers and a magical make believe land which is a versatile and that is why the IP's work there. I'm sure Alton can see this, IP's going in a pre-themed land would be no decent reason to overhaul a complete retheme.
Also I don't think we would get a IP for a SW. A vital part of a Secret Weapon is it's memroble marketing, can you remember Spinball Whizzer and Rita's marketing and brand if you were not a enthusiast? Probably not. And even if we were to get another Sonic coaster, (which we won't) Spinball's contract would have to be extended and seeing that the two new family products heavily pointing to Adventure and Storybook Land. Sonic is going. Also Alton Towers isn't a gaming theme park, SEGA have their own theme park for their own character. Using Sonic is a simple brand that is easy to pull in crowds, not to revolve around a whole area in a mainly original theme park. As much I would love to see this happen, it won't. Also turbo boost isn't really mentioned in Sonic, make a better reference before speculating it's possibility!